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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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Carrier-assisted differential detection.

William Shieh1, Chuanbowen Sun1, Honglin Ji1

  • 1Department of Electrical and Electronic Engineering, The University of Melbourne, Parkville, VIC3010 Australia.

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|February 13, 2020
PubMed
Summary
This summary is machine-generated.

A new carrier-assisted differential detection (CADD) receiver enables optical field recovery for double sideband (DSB) signals. This method doubles spectral efficiency and uses cost-effective lasers for direct detection systems.

Keywords:
Applied opticsOptical techniques

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Area of Science:

  • Optical Communications
  • Signal Processing

Background:

  • Chromatic dispersion causes power fading in optical fiber communications.
  • Existing optical field recovery methods (Kramers-Kronig, SSBI IC) use single sideband (SSB) modulation, losing spectral efficiency and requiring complex filters.
  • There is a need for direct detection schemes that support double sideband (DSB) modulation for improved spectral efficiency.

Purpose of the Study:

  • To propose a novel receiver scheme for optical field recovery of complex-valued DSB signals using direct detection.
  • To enhance spectral efficiency in short-reach optical communication systems.
  • To reduce receiver complexity and cost in data center interconnects.

Main Methods:

  • Introduction of the carrier-assisted differential detection (CADD) receiver architecture.
  • Utilizing double sideband (DSB) modulation for signal transmission.
  • Implementing direct detection without a precise receiver optical filter.

Main Results:

  • The CADD receiver achieves optical field recovery for DSB signals.
  • CADD doubles electrical spectral efficiency compared to SSB-based methods (KK, SSBI IC).
  • The scheme maintains receiver sensitivity and avoids the need for precise optical filters, enabling the use of uncooled lasers.

Conclusions:

  • The proposed CADD receiver offers a new approach for direct detection optical field recovery.
  • CADD enhances spectral efficiency and reduces costs for short-reach optical communication systems like data center interconnects.
  • This architecture is suitable for photonic integration, similar to homodyne receivers in coherent detection.